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Net Pension Assets - Summary of Sensitivity Analysis for Actuarial Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Discount rate [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial assumption rate | 3.15% | 3.37% | 3.45%
Compensation - salary increase [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial assumption rate | 4.00% | 4.00% | 4.00%
Mortality [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Demographic assumptions, Mortality | RP - 2000 no collar | RP - 2000 no collar | RP - 2000 no collar
Termination [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial assumption rate | 13.00% | 13.00% | 13.00%
Male [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Retirement age | 62 | 62 | 62
Female [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Retirement age | 57 | 57 | 57

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- Definition The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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